Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays
The photon spectrum in B→X[subscript s]γ decay, where X[subscript s] is any strange hadronic state, is studied using a data sample of (382.8±4.2)×10[superscript 6] e[superscript +]e[superscript -]→Υ(4S)→BB̅ events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to meas...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/77040 |
| _version_ | 1826193539661299712 |
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| author | Dujmic, Denis Sciolla, Gabriella Cowan, Ray F |
| author2 | Massachusetts Institute of Technology. Laboratory for Nuclear Science |
| author_facet | Massachusetts Institute of Technology. Laboratory for Nuclear Science Dujmic, Denis Sciolla, Gabriella Cowan, Ray F |
| author_sort | Dujmic, Denis |
| collection | MIT |
| description | The photon spectrum in B→X[subscript s]γ decay, where X[subscript s] is any strange hadronic state, is studied using a data sample of (382.8±4.2)×10[superscript 6] e[superscript +]e[superscript -]→Υ(4S)→BB̅ events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction B(B→Xsγ)=(3.21±0.15±0.29±0.08)×10-4 and the first, second, and third moments (E[subscript γ)=2.267±0.019±0.032±0.003 GeV, ((E [subscript γ-](E[subscript γ]))[superscript 2])=0.0484±0.0053±0.0077±0.0005 GeV[superscript 2], and ((E[subscript γ-](E[subscript γ]))[superscript 3])=0.0048±0.0011±0.0011±0.0004 GeV[superscript 3], for the range E[subscript γ]>1.8 GeV, where E[subscript γ] is the photon energy in the B-meson rest frame. Results are also presented for narrower E[subscript γ] ranges. In addition, the direct CP asymmetry A[subscript CP](B→X[subscript s+dγ]) is measured to be 0.057±0.063. The spectrum itself is also unfolded to the B-meson rest frame; that is the frame in which theoretical predictions for its shape are made. |
| first_indexed | 2024-09-23T09:40:44Z |
| format | Article |
| id | mit-1721.1/77040 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:40:44Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/770402023-02-26T05:36:11Z Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays Dujmic, Denis Sciolla, Gabriella Cowan, Ray F Massachusetts Institute of Technology. Laboratory for Nuclear Science Cowan, Ray Franklin Dujmic, Denis Sciolla, Gabriella The photon spectrum in B→X[subscript s]γ decay, where X[subscript s] is any strange hadronic state, is studied using a data sample of (382.8±4.2)×10[superscript 6] e[superscript +]e[superscript -]→Υ(4S)→BB̅ events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction B(B→Xsγ)=(3.21±0.15±0.29±0.08)×10-4 and the first, second, and third moments (E[subscript γ)=2.267±0.019±0.032±0.003 GeV, ((E [subscript γ-](E[subscript γ]))[superscript 2])=0.0484±0.0053±0.0077±0.0005 GeV[superscript 2], and ((E[subscript γ-](E[subscript γ]))[superscript 3])=0.0048±0.0011±0.0011±0.0004 GeV[superscript 3], for the range E[subscript γ]>1.8 GeV, where E[subscript γ] is the photon energy in the B-meson rest frame. Results are also presented for narrower E[subscript γ] ranges. In addition, the direct CP asymmetry A[subscript CP](B→X[subscript s+dγ]) is measured to be 0.057±0.063. The spectrum itself is also unfolded to the B-meson rest frame; that is the frame in which theoretical predictions for its shape are made. Alfred P. Sloan Foundation United States. Dept. of Energy National Science Foundation (U.S.) 2013-02-14T16:47:58Z 2013-02-14T16:47:58Z 2012-12 2012-07 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1089-4918 http://hdl.handle.net/1721.1/77040 Lees, J. P. et al. “Measurement of B (B→X_{s}γ), the B→X_{s}γ Photon Energy Spectrum, and the Direct CP Asymmetry in B→X_{s+d}γ Decays.” Physical Review D 86.11 (2012). © 2012 American Physical Society en_US http://dx.doi.org/10.1103/PhysRevD.86.112008 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Dujmic, Denis Sciolla, Gabriella Cowan, Ray F Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays |
| title | Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays |
| title_full | Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays |
| title_fullStr | Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays |
| title_full_unstemmed | Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays |
| title_short | Measurement of B (B→X[subscript sγ]), the B→X[subscript sγ] photon energy spectrum, and the direct CP asymmetry in B→X[subscript s + dγ] decays |
| title_sort | measurement of b b x subscript sγ the b x subscript sγ photon energy spectrum and the direct cp asymmetry in b x subscript s dγ decays |
| url | http://hdl.handle.net/1721.1/77040 |
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